@t8/event-patterns

Lightweight zero-dependency event emitter with flexible event type matching

Installation: npm i @t8/event-patterns

Usage

Initialization:

import {EventEmitter} from '@t8/event-patterns';

let eventEmitter = new EventEmitter();

Adding a handler of a specific event type:

eventEmitter.on('task started', event => {
    console.log(event);
});

Of all events matching the pattern:

eventEmitter.on(/^task\s/, event => {
    console.log(event);
});

With captured parameters:

eventEmitter.on(/^(\S+)\s(?<status>.*)$/, event => {
    console.log(event.params[0], event.params.status);
});

Adding a handler of all events dispatched to the eventEmitter instance:

let listener = eventEmitter.on('*', event => {
    console.log(event);
});

Dispatching an event of a specific type and properties:

eventEmitter.emit('task started', {x: 42});

Removing a previously declared listener:

listener.remove();